You and the mark each throw a set amount into the pot. The mark begins
to shake 3 coins together in his or her fist. Asked to pick heads or
tails, the mark picks heads. The coins are thrown on the table. If three
heads show up, the mark wins; if three tails shows up, you win. If
there is a mix of heads and tails, nobody wins and each party again
throw more money into the pot. This back and forth continues until
somebody wins.